My First (Kinda) Incompatible EF Lens.

[Dale.]

I may have found one, an EF lens that doesn't behave well on an R body and it's a Canon lens too.

The lens in question is the 300f4L IS USM. 90's tech admittedly but I didn't expect it to be clunky as heck on my R7. It's a lens I've owned from new but it's lived most of its life in its case in my gear cupboard, it's like new cosmetically. A bit of a shame the lack of use it's had but that's another story.

I wanted to try it on the R7 as it's a decent aperture and would give me 480mm equivalent on that body, which would be an improvement over the 400 5.6 I currently have.

It wasn't great at all on the R7, I was worried but I tried it today on my 5Div and it's like butter, so it's not the lens. My theory is, the in lens stabilisation is clashing with the IBIS on the body.

This is the first issue I've experienced when adapting EF glass to an RF body, my other lenses are seamless.

Has anybody else had problems with Canon EF glass adapted to an R body?

 

[davidy233]

Just tried my 300f4 on the R5mkii (which hasn't been on one of my cameras in a decade) and it's OK - I've been used to faster lenses these days so it wasn't impressive but I could use it in an emergency if my 400 f2.8 was in for repair.

 

[TimHughes]

I may have found one, an EF lens that doesn't behave well on an R body and it's a Canon lens too.

The lens in question is the 300f4L IS USM. 90's tech admittedly but I didn't expect it to be clunky as heck on my R7. It's a lens I've owned from new but it's lived most of its life in its case in my gear cupboard, it's like new cosmetically. A bit of a shame the lack of use it's had but that's another story.

I wanted to try it on the R7 as it's a decent aperture and would give me 480mm equivalent on that body, which would be an improvement over the 400 5.6 I currently have.

It wasn't great at all on the R7, I was worried but I tried it today on my 5Div and it's like butter, so it's not the lens. My theory is, the in lens stabilisation is clashing with the IBIS on the body.

This is the first issue I've experienced when adapting EF glass to an RF body, my other lenses are seamless.

Has anybody else had problems with Canon EF glass adapted to an R body?

Thanks for flagging this Dale. I do have quite a range of Canon EF lenses and have not had any problems. Out of curiosity, did the problem go away when you switched IBIS off?